Drag-saw machine.



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\ n. REIERSON. DRAG sAw MACHINE.

APPLICATION FILED MAR. 28. 1918.

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DRAG-SAW MACHINE.

Specification of Letters Patent.

Patented Api'. 15, 1919.

Application led March 28, 1918. Serial No. 225,218.

drag-saw machines used as an auxiliary to gas engines or other rotary motors; and the objects of my invention are, first, to pro' vide a mechanism which will convert rotary into reciprocating motion; second, to impart to the saw at the end of every stroke a rocking motion in Order to rid the cut of the sawdust which proves so troublesome in fast cutting; third, to provide an adjustable,

-hand-operated, self-locking clutch wherewith the saw can be started andstopped Without interfering with the operation of the engine; should, for some reason or other, the saw become pinched during the sawing, the clutch can be adjusted to slip rather than break the machine; fourth, to provide means for lifting and lowering the saw while in operation; fifth, to furnish a novel and practical means of connecting the drag-saw machine tO and releasing it from the saw-log.

I attain these objects by the mechanism illustrated in the accompanying drawings,

in which:

Figure I is avplain view of the entire machine; Fig. II, a partial side view, a section having been made across the driving shaft at line a-w in'Fig. I; Fig. III, a slightly enlarged section of Fig. I taken along line 'Zn-b; Fig. IV, a side view of the clutch mechanism as it appears when detached from the shaft; Fig. V, a plan view of the clutch band holder; Fig. VI, a front view of the guiding shoe for the extension bar; Fig. VII, a section'through Fig. VI, taken along the line c.-6; Fig. VIII, a full View of the hand lever; Fig. IX, a slightly en larged portion of the driving sprocket with special reference to its ball bearing feature; and finally Fig. X, al plan view of the clutch band tightener.

Similar numerals refer to similar parts throughout the severalviews. l

On the rotary shaft 1 Of a gas engine or other motor are placed in sequence cone 2, clutch band holder 3, clutch wheel 4 and sprocket vwheel 5. All of them are mounted loosely except Clutch band holder 3 which is keyedtightly in place by means of key 6 shown in Fig. III; the respective keyway being illustrated at 7 in Fig. IV. Set screw 8 furnishes the safeguard against misplacement in axial direction.

The radially projecting arm 9 of the clutch band holder 3 carries a clutch band tightener 10 which is practically a lever With the fulcrum at 11 so that cone 2, acting on end 12, can tighten the clutch band 13 attached to end 14 of said clutch band tightener. f To make the clutch self-locking the cone 2 is pressed, by means of hand lever 15, under endj12 until projection 1G rests on the cylindrical part 17 of cone 2, causing latter .-to revolve in unison with the clutch until the hand lever is withdrawn again.

To permit the cone to revolve with the least possible friction the hand lever 15 is provided with anti-friction rollers 18 18 (see Fig. VIII) fitting into an annular groove 19 on cone 2. For conveniences sake the handlever 15 is shaped out of two flat iron pieces 20 20, held together by bolts or rivets `at 21, although any otherconstruction may be chosen if desired. At its lower end 2.2 the hand lever is attached to the base plate 23 of the drag-saw machine.

For the purpose4 of fastening clutch band 13 to the clutch band tightener 10 latter eX- tends a rod or linger 24 across the rim of the adjacent clutch wheel 4 and into the eye 25 of the clutch band 13; nut 26 prevents the eye 25 from slipping off finger 24. After encircling the rim of said clutch Wheel, the clutch band ends in a threaded portion 27 Which enters hole 28 in lug 29 of the clutch -band holder 3; nut 30v serves to adjust the clutch band to' any amount of frictional grip desired. Flanges 31 31 prevent a lateral escape of the clutch wheel from the en circling clutch band. It may be stated at this time that the clutch band 13 is equipped With a non-burning composition lining 324 The clutch wheel hub 33, on the side nearest the sprocket wheel 5, has an enlarged bore with inside thread corresponding with the outside thread 34 On-the sprocket wheel hub 35; those two elements, when screwed together forming an integral part for operative purposes. The advantages of screwing them together rather than casting them in one piece are threefold; first, the sprocket wheel which is subjected to a large amount of wear caneasily be case-hardened; second, a ball or roller bearing 36 can conveniently be fitted to the hub 35 -and held there laterally secure by the clutch wheeel hub 33; third, the sprocket wheel 5 can, without the workman being inconvenienced by the ponderous clutch wheel, be incorporated into the rack frame while the latter is being riveted together, its appearance at this sta e being similar to Fig. III.

he teeth 37 of sprocket wheel 5 work in a rack formed of a single, straight row of antifrict-ion pins 38, except at both ends 39 39 where the pins are set in a circular curve.

The reasons for doing this are twofold; first, in rounding this curve a rocking motion will be imparted to the saw, which shakes the sawdust from it; second, the transition from the lower race-track 40 to the upper 41 and vice versa is accomplished in a smooth and easy manner instead of making it jerky as would be the case if the transition had to take place around one single end pin.

Pins 38 are riveted into an iron plate 42, the edges of which are substantially equidistant from the center line of said rack pins; a metal rim 43 is secured along the edge and on this rim a railing 44 which partly forms one of the tracks 45 for the ball bearing 36 and partly covers and confines the teeth of the sprocket wheel 5 within the rack frame, The complemental track 46 is riveted to the rack pins 38. The anti-friction feature of the pins 38 is illustrated in Fig. III and consists of two loosely tting, concentric sleeves surrounding said pins.

To projection 49 of plate 42 is riveted the extension bar 50 and to latter again is bolted saw 51. The extension bar 50 travels between two angle iron guides 52 52, they being riveted at 53 to the base plate 23. The guides in this drawing are shown curved although straight guides may be used. To insure rigidity of construction braces 54 54 are riveted at 55 to the angle iron guides 52 and at 56 to the base plate 23. A spacer bolt 57 connects the top of guides 52 and serves at the same time as pivotal support for the hook 58 which latter is used to engage a hook 59 in the guiding shoe 60 when the saw is to be lifted clear of the log 61; the position of hook and guiding shoe in such a case are indicated in Fig. II by dotted lines 58a and 60a respectively.

The guiding shoe, shown in detail in Fig.

. VI, consists essentially of a rectangular body portion with a rectangular opening .62 to permit the extension bar 50 free passage. The lateral edges 63 63 (see Fig. "VII) are turned backward and inward to t over the legs of the angle irons 52, so that shoe 60 is restricted to a vertical sliding movement along the face of said angle irons. Handles 64 64 furnish a convenient means of raising or lowering the shoe and thereby the extension bar 50 with the att-ached saw 51.'

A dog connects the drag-saw machine with the log 61 and prevents latter from rolling under the reciprocating motion of the saw. This dog comprises a tube 65 whose one end 66. is pivotally connected to the base plate 23, while into the other, open end 67 ts slidingly a spur-carrying rod 68. The head 69 of spur 70 is bent at a right angle to said spur and high enough above the penetrating limit of the latter to perinit the inserti-on of an ax, crowbar, or other instrument under the head for the purpose of withdrawing the spur from the log. A hand-screw 7l xes the rod 68 within the tube 65. ,f

Brackets 71a 71, bolted at 72 to the base plate 23, and at 73 73 to the engine bed, keep both last named elements 'in proper alinement.

.I-Iaving fully described my invention, it will be seen that my objects have been-accompllshed, and, though I have shown the preferred form of my invention, I reserve to myself the right to make minor changes in construction so longl as I do not violate the disclosed principle.

I claim:

l. In a drag-saw machine, the combination of a rotary shaft, a sprocket wheelattached to the end of the shaft, said sprocket wheel guidlng and propelling a rack frame having one single row of rack pins at the longitudinal center line, said rack pins, at both ends of the row, disposed in the figure of an endless loop, adapted to impart a rocking motion to the saw at the end of every stroke; an extension bar secured to one end of the rack frame and a saw removably connected to the end of the extension bar.

2. In a drag-saw machine, the combination of a rotary shaft, a sprocket wheel having on one side a protruding hub and being attached to the end of the shaft, a rack frame guided and propelled by said sprocket wheel and composed of an elongated body portion having one single row of rack pins at the longitudinal center line of the body portion, said pins, at both ends of the row,

disposed in the figure of an endless loop,

adapted to impart a rocking motion to the saw at the end of every stroke, the edge of the body portion having a railing confining the sprocket wheel within the rack frame and serving as track for the hub of the sprocket wheel, the complemental track be-A ing attached to the rack pins; an. extension bar at one end of the rack frame vand a saw at the end of the extension bar.

3. In a drag-saw machine, a horizontal base plate having brackets on one side for securing the base plate to an engine bed, having, on the side .nearest to the engine, means for attaching a clutch shifting lever, having, at the end nearest to 4the log, two substantially vertical angle iron posts, and

braces extending from'the top of the posts 130 1,300,650 ist to thebase plate, said posts 'being connected at the top and having depending therefrom a swinging catch, a shoe slidably mounted on the angle iron posts, having a rectangular perforation through the body to permit free passage to the extension bar of a saw, hav-l ing handles extending laterally and outwardly from the shoe to permit the liftingl or lowering of the saw during operation, and having means of engaging said swinging 10 catch; the base plate having at the end nearest t'o the log means for attaehinga dog to maintain engine, base plate and login a fixed melation.

RENHART REIERSON. 

